vsamov/java-technologies repository overview

⁠java-technologies

Java⁠ is Simple, Object Oriented, Distributed, Multithreaded, Dynamic, Architecture neutral, Portable, High performance, Robust, Secure. The Java tutorial⁠ are practical guides for programmers who want to use the Java⁠ programming language to create applications.

Oracle Java Documentations:⁠

• Trail Covering the Basics.
• Creating Graphical User Interfaces (GUI).
• Specialized Trail and Lessons.

⁠MapReduce

WordCount⁠ example reads text files and counts how often words occur. To run mapreduce Hadoop environment is required. Read more⁠ To run example:

• Run mvn clean verify for java-technologies project

• Optional: Copy .jar file to server which is connected to Hadoop

  • scp -p target/*.jar [server-name]:

• Assume hdfs location is /user/[user-name]/java-mapreduce

• Copy resource(s)⁠ file to hdfs: hdfs dfs -put /user/[user-name]/java-mapreduce

• Run command below:

    # syntax: hadoop jar [jar-name].jar [java-class] [input-files] [output-dir]
    hadoop jar java-technologies-0.0.1-SNAPSHOT.jar com.samovich.specialized.mapreduce.WordCount /user/WDPRO-CUSTANALYTICS-PROD/java-mapreduce/*.txt /user/WDPRO-CUSTANALYTICS-PROD/java-mapreduce/output
  

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⁠Appendix

• Java Reference Guide⁠ is a free tutorial for syntax and examples.
• Maven repositories⁠ is used to hold build artifacts and dependencies of varying types.
• JSON Online Editor⁠ is a web-based tool to view, edit, and format JSON with tree view.
• JSON Lint⁠ is a web-based JSON Validator.
• JSON Path⁠ is a web-based online tool JSON Path evaluator.
• Vogella⁠ Provides premium Java, Android and Git training and support.
• Java Brains⁠ Learn and advance your Java skills online.
• Mkyong⁠ Java, and Testing Frameworks, Web Services Build Tools examples and etc.
• Michael Noll⁠ Applied Research. Big Data. Distributed Systems. Open Source.

⁠Notes

• DRY (Don't Repeat Yourself) and other tips from The Pragmatic Programmer
• SOLID Principles of Object-Oriented Programming:
  • S : Single Responsibility Principle
  • O : Open/Closed Principle
  • L : Liskov Substitution Principle
  • I : Interface Segregation Principle
  • D : Dependency Inversion Principle